Many of these tests were blacklisted because of the possibility of a std::terminate during a stepdown. I'm not sure what caused this in the first place but it seems likely we will resolve this after translating the mapReduce implementation to aggregation.

This ticket tracks the work to figure out whether these tests can be un-blacklisted (have the 'does_not_support_stepdown' tag removed). It'd be great if we could figure out what was causing this originally but it doesn't seem as high priority.